Concatenate multiple IEnumerable

Question

I\'m trying to implement a method to concatenate multiple Lists e.g.

List l1 = new List { \"1\", \"2\" };
List

        

Answer 1

All you have to do is to change:

public static IEnumerable Concatenate(params IEnumerable lists)

to

public static IEnumerable Concatenate(params IEnumerable[] lists)

Note the extra [].